Invoke GattDiscoveryCompleteForService by observing ServicesResolved property

device/bluetooth/dbus/fake_bluetooth_gatt_service_client.h

Index: device/bluetooth/dbus/fake_bluetooth_gatt_service_client.h
diff --git a/device/bluetooth/dbus/fake_bluetooth_gatt_service_client.h b/device/bluetooth/dbus/fake_bluetooth_gatt_service_client.h
index 41dbf7e86bd61bbf200aa05c9ec03c78270831ad..d56a35527f2a5a49d74ec3e1a68c33432d61ea9a 100644
--- a/device/bluetooth/dbus/fake_bluetooth_gatt_service_client.h
+++ b/device/bluetooth/dbus/fake_bluetooth_gatt_service_client.h
@@ -55,6 +55,11 @@ class DEVICE_BLUETOOTH_EXPORT FakeBluetoothGattServiceClient
   void ExposeHeartRateService(const dbus::ObjectPath& device_path);
   void HideHeartRateService();
 
+  // Makes a service visible for device with object path |device_path| without
+  // delay. Note that only one instance of a specific service is simulated at a
+  // time, if the service is already visible.
+  void ExposeHeartRateServiceWithoutDelay(const dbus::ObjectPath& device_path);
+
   // Returns whether or not the Heart Rate Service is visible.
   bool IsHeartRateVisible() const;
 
@@ -85,6 +90,11 @@ class DEVICE_BLUETOOTH_EXPORT FakeBluetoothGattServiceClient
   // time this method is called, then it does nothing.
   void ExposeHeartRateCharacteristics();
 
+  // Toggles the ServicesResolved property for the device with |object_path|.
+  // This should be done after a service is fully discovered.
+  void ToggleServicesResolvedProperty(const dbus::ObjectPath& object_path,
+                                      bool resolved);
+
   // Static properties we return. As long as a service is exposed, this will be
   // non-null. Otherwise it will be null.
   std::unique_ptr<Properties> heart_rate_service_properties_;